import javax.mail.MessagingException
import org.springframework.mail.MailException
import org.springframework.mail.SimpleMailMessage

/**
 * Simple service for sending emails.
 *
 * Work is planned in the Grails roadmap to implement first-class email
 * support, so there's no point in making this code any more sophisticated.
 *
 * @author Haotian Sun
 */
class EmailerService {

  boolean transactional = false

  def mailSender
  def mailMessage // a "prototype" email instance

  /**
   * Send a list of emails.
   *
   * @param mails a list of maps
   */
  def sendEmails(mails) {

    // Build the mail messages
    def messages = []
    for (mail in mails) {
      // create a copy of the default message
      def message = new SimpleMailMessage(mailMessage)
      message.to = mail.to
      message.text = mail.text
      message.subject = mail.subject
      messages << message
    }

    // Send them all together
    try {
      mailSender.send(messages as SimpleMailMessage[])
    }
    catch (MailException e) {
      log.error "Failed to send emails: $e.message", e
    }
    catch (MessagingException e) {
      log.error "Failed to send emails: $e.message", e
    }
  }
}
